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Simplifying 15 = 3u + -12 Reorder the terms: 15 = -12 + 3u Solving 15 = -12 + 3u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-3u' to each side of the equation. 15 + -3u = -12 + 3u + -3u Combine like terms: 3u + -3u = 0 15 + -3u = -12 + 0 15 + -3u = -12 Add '-15' to each side of the equation. 15 + -15 + -3u = -12 + -15 Combine like terms: 15 + -15 = 0 0 + -3u = -12 + -15 -3u = -12 + -15 Combine like terms: -12 + -15 = -27 -3u = -27 Divide each side by '-3'. u = 9 Simplifying u = 9
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